Resolution improvement and general study in moving-optical-wedge Fourier transform spectrometer

We propose two modifications to the ordinary moving-optical-wedge interferometer as it works as Fourier transform spectrometer. First we propose new direction of motion of the wedge and the second is of structure of that moving wedge by attaching a mirror to it. We increase the maximum OPD by maximizing the displacement. On the other side we obtain factor (OPD/Displacement) less than two for immunity against motion error fluctuations. Upon using both of the two modifications at the same time we get very high resolution. Typically obtained values are fractions in (1/cm). Actually, we increase the maximum optical path difference to improve resolution. Further, we present a general study of the interferometer regarding: reflection, transmission, and phase difference in the interferometer. We discuss how these parameters affect performance of the system. These parameters degrade the interferometer performance.